Across
- 3. a region of space having a gravitational field so intense that no matter or radiation can escape.
- 5. a prominent pattern or group of stars, typically having a popular name but smaller than a constellation.
- 6. a cosmological model of the observable universe from the earliest known periods through its subsequent large-scale evolution.
- 7. the science of the origin and development of the universe.
- 13. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.
- 14. to measure distances to nearby stars.
- 15. a very large star of high luminosity and low surface temperature.
Down
- 1. a small galaxy composed of about 1000 up to several billion stars, as compared to the Milky Way's 200–400 billion stars.
- 2. An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image.
- 4. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
- 8. ball of gas
- 9. Galaxy
- 10. existing matter and space considered as a whole; the cosmos.
- 11. the science of the origin and development of the universe.
- 12. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
- 15. the displacement of spectral lines toward longer wavelengths (the red end of the spectrum) in radiation from distant galaxies and celestial objects.